The argument is invalid but sound.
The premises state that all birds have feathers and that all feathered creatures can fly. However, these premises do not necessarily mean that all birds can fly, as there are exceptions among feathered creatures (e.g., ostriches, penguins, etc.) that do not fly. Therefore, while the logic follows correctly from the premises to the conclusion based on the provided statements, the conclusion is not universally true, making the argument invalid.